USB2524-ABZJ Standard Microsystems (SMSC), USB2524-ABZJ Datasheet
USB2524-ABZJ
Specifications of USB2524-ABZJ
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USB2524-ABZJ Summary of contents
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... Host Ownership & Port Speed Mode - 8 Dual-Color LEDs are used to indicate which upstream host each of the downstream ports are assigned to, while simultaneously indicating downstream port connection speed. SMSC USB2524 USB2524 USB MultiSwitch Enhanced configuration options available through either a Single Serial I Port — ...
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... USB2524-ABZJ for 56-pin QFN Lead-Free RoHS Compliant Package 80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123 Copyright © 2007 SMSC or its subsidiaries. All rights reserved. Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for construction purposes is not necessarily given ...
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... Register 16h-53h: Manufacturer String (Reset = 0x00 7.1.4.24 Register 54h-91h: Product String (Reset = 0x00 7.1.4.25 Register 92h-CFh: Serial String (Reset = 0x00 7.1.4.26 Register D0h: Port Interface Delay Timer (Reset = 0x00 7.1.4.27 Register D1h: Port Assign Interface Configuration 0A (Reset = 0x00 SMSC USB2524 3 DATASHEET Revision 1.91 (08-22-07) ...
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... General Call Address Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 7.3.4 Slave Device Time-Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 7.3.5 Stretching the SCLK Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 7.3.6 SMBus Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 7.3.7 Bus Reset Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 7.3.8 SMBus Alert Response Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 7.3.8.1 Undefined Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 7.3.8.2 Reserved Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Revision 1.91 (08-22-07) 4 DATASHEET TM USB MultiSwitch Hub Datasheet SMSC USB2524 ...
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... RESET_N for SMBus Slave Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 9.1.2 USB Bus Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Chapter 10 XNOR Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Chapter 11 DC Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 11.1 Maximum Guaranteed Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 11.1.1 DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 Chapter 12 AC Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 12.1 Oscillator/Clock 12.1.1 SMBus Interface 12.1.2 I2C EEPROM 12.1.3 USB 2 Chapter 13 Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 SMSC USB2524 5 DATASHEET Revision 1.91 (08-22-07) ...
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... Figure 8.1 Dual Color LED Implementation Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Figure 9.1 Reset_N Timing for Default/Strap Option Mode Figure 9.2 Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 Figure 9.3 Reset_N Timing for SMBus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Figure 13.1 USB2524 56-Pin QFN Package Outline and Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Revision 1.91 (08-22-07) 6 DATASHEET ...
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... Table 4.3 Miscellaneous Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 4.4 Power, Ground, and No Connect Table 4.5 Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Table 6.1 USB2524 Port Assign Interface (Embedded Mode Table 7.1 Internal EEPROM & SMBus Register Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Table 9.1 Reset_N Timing for Default/Strap Option Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Table 9.2 Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 Table 9 ...
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... Hub ports support Low-Speed, Full-Speed, and High-Speed (if operating as a High-Speed Hub) downstream devices on all of the enabled downstream ports. A USB peripheral or USB Hub that is attached to one of the downstream USB2524 ports will be available to one or the other of the upstream USB host controllers, but can never be simultaneously shared with both host controllers ...
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... Strapping option pins make it possible to modify a limited sub-set of the configuration options. The USB2524 may also be configured by an external EEPROM or a microcontroller. When using the microcontroller interface, the Hub appears as an SMBus slave device. If the Hub is pin-strapped for external EEPROM configuration but no external EEPROM is present, then a value of ‘ ...
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... Chapter 2 Pin Layout Table 2.1 USB2524 56-Pin QFN Pin Configuration Table UPSTREAM USB 2.0 INTERFACES (6 PINS) USBUP_DP1 VBUS_DET1 DOWNSTREAM 4-PORT USB 2.0 INTERFACE (30 PINS) USBDN_DP1 USBDN_DM1 USBDN_DP3 USBDN_DM3 LED_A1_N/NON_REM0 LED_A2_N/NON_REM1 LED_B1_N PRTPWR1 PRTPWR3 USBDN_DM4 LED_B4_N SDA/SMBDATA SCL/SMBCLK/ XTAL1/CLKIN TEST VDDPLL18(1) DIGITAL POWER, GROUND & NO CONNECT (6 PINS) VDD33(3) Revision 1 ...
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... VBUS_DET1 45 VBUS_DET2 46 VDDA33 47 USBUP_DP2 48 USBUP_DM2 49 VDDCR18 50 XTAL2 51 XTAL1/CLKIN 52 VDDPLL18 53 VDD33 RBIAS 56 SMSC USB2524 SMSC USB2524 (Top View QFN-56) thermal slug connects to VSS Figure 3.1 USB2524 QFN-56 11 DATASHEET 28 LED_A2_N/NON_REM1 27 PRTPWR1 26 OCS1_N 25 OCS2_N 24 PRTPWR2 23 PRTPWR3 22 OCS3_N 21 OCS4_N 20 PRTPWR4 19 PRTPWR_POL 18 TEST 17 VDD33 16 VDDCR18 15 LED_B3_N ...
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... PRT_DIS[1:0] = '01', Port 4 is disabled, LED_A4_N is active high, LED_A3_N is active low. PRT_DIS[1:0] = '10', Ports 4 & 3 are disabled, LED_A4_N is active low, LED_A3_N is active high. PRT_DIS[1:0] = '11', Ports 4, 3 & 2 are disabled, LED_A4_N is active low, LED_A3_N is active low. 12 DATASHEET TM USB MultiSwitch Hub Datasheet FUNCTION SMSC USB2524 ...
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... Polarity strapping Over Current OCS[4:1]_N Sense USB Transceiver RBIAS Bias SMSC USB2524 TYPE FUNCTION I/O12 Green indicator LED for ports 2 and 1. Will be active low when LED support is enabled via EEPROM or SMBus. If the hub is configured by the internal default configuration, these pins will be sampled at RESET_N negation to determine if ports [3:1] contain permanently attached (non- removable) devices ...
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... Strap options on pins LED_A[4:1]_N are enabled. No support for unassigned Ports. LED Mode = USB Mode 1 2-wire (I2C) EEPROMS are supported, LED Mode = See Chapter 8, LED Interface Description 14 DATASHEET TM USB MultiSwitch Hub Datasheet FUNCTION Chapter 6, Assigning Ports for Table 4.2. Table 4.2. Table 4.2. FUNCTION SMSC USB2524 ...
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... TEST Pin TEST Table 4.4 Power, Ground, and No Connect NAME SYMBOL VDD Core VDDCR18 VDDIO 3.3V VDD33 SMSC USB2524 NAME 0 Internal Default Configuration PRT_ASSIGN[3:0] = Peripheral Mode (Edge Triggered) LED Mode = Host Ownership Mode Strap options on pins LED_A[4:1]_N are enabled. Supports unassigned Ports ...
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... Filtered analog power for internal PLL. This pin must have a 4.7 Ω) <0.1 capacitor to VSS +3.3V Filtered analog PHY power, shared between adjacent ports. Ground No Connect Table 4.5 Buffer Type Descriptions DESCRIPTION 16 DATASHEET TM USB MultiSwitch Hub Datasheet FUNCTION μ F (or greater) ±20% (ESR SMSC USB2524 ...
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... lts rfa tro lle tro lle tro lle tro lle itc tre itc h D riv itc h D riv riv riv itc tre riv Figure 5.1 USB2524 Switching Hub Block Diagram tre tre tin tre itc h D riv riv itc tre itc ...
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... PRT_ASSIGN interface. The PRT_ASSIGN interface has three operating modes. One is called the Embedded Mode, and the other is Peripheral Mode (with two different electrical “sub” modes; (level triggered or edge triggered). Note: Any change in PRT_ASSIGN pins will be ignored until the USB2524 is out of reset. 6.1.1 Embedded Mode: ...
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... In this mode, the SMBus interface remains “live” during operation of the switching hub and is used to switch/assign ports “on-the-fly” through SMBus commands. This is accomplished through register direct writes to the Port Assignment registers (see the USB_ATTACH description under Status/Command (Reset = 0x00) on page SMSC USB2524 Register D0h: Port Interface Delay Timer (Reset = 39). 19 ...
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... Config Data Byte 1 Config Data Byte 2 Config Data Byte 3 Non-Removable Devices 20 DATASHEET TM USB MultiSwitch Hub Datasheet DEFAULT ABBR ROM VIDL 24h VIDM 04h PIDL 24h PIDM 25h DIDL 00h DIDM 00h CFG1 9Bh CFG2 10h CFG3 00h NRD 00h SMSC USB2524 ...
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... R/W F3h R/W F4h R/W F5h R/W F6h-FEh R/W FFh R/W SMSC USB2524 REGISTER NAME Port Disable (Self) Port Disable (Bus) Max Power (Self) Max Power (Bus) Hub Controller Max Current (Self) Hub Controller Max Current (bus) Power-on Time LANG_ID_H LANG_ID_L ...
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... BCD format (assigned by OEM). This field is set by the OEM using either the SMBus or EEPROM interface options. DESCRIPTION Most Significant Byte of the Device ID. This is a 16-bit device release number in BCD format (assigned by OEM). This field is set by the OEM using either the SMBus or EEPROM interface options. 22 DATASHEET TM USB MultiSwitch Hub Datasheet SMSC USB2524 ...
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... EOP_DISABLE 2:1 CURRENT_SNS 0 PORT_PWR SMSC USB2524 DESCRIPTION Self or Bus Power: Selects between Self- and Bus-Powered operation. The Hub is either Self-Powered (draws less than 2mA of upstream bus power) or Bus-Powered (limited to a 100mA maximum of upstream power prior to being configured by the host controller). When configured as a Bus-Powered device, the SMSC Hub consumes less than 100mA of current prior to being configured ...
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... Port Assign Interface is configured for Direct Port Control. (4-Wire), edge Sensitive, and Unassigned state is not supported. ‘11’ = Port Assign Interface is configured for Direct Port Control. (4-Wire), edge Sensitive, and the Unassigned state is supported. 24 DATASHEET TM USB MultiSwitch Hub Datasheet SMSC USB2524 ...
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... STRING_EN 7.1.4.10 Register 09h: Non-Removable Device (Reset = 0x00) BIT NUMBER BIT NAME 7:0 NR_DEVICE SMSC USB2524 DESCRIPTION ‘0’ = Port assignment is controlled by hardware interface pins ‘1’ = Port assignment is controlled by: PORT_ASSIGN_12 PORT_ASSIGN_34 PORT_ASSIGN_56 PORT_ASSIGN_7 Reserved, always = ‘0’. LED Mode Selection: The LED_A[4:1]_N and LED_B[4:1]_N pins support several different modes of operation (depending upon OEM implementation of the LED circuit) ...
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... VBUS) of all associated circuitry on the board. This value also includes the power consumption of a permanently attached peripheral if the hub is configured as a compound device, and the embedded peripheral reports 0mA in its descriptors. Note: The USB 2.0 Specification does not permit this value to exceed 100mA 26 DATASHEET TM USB MultiSwitch Hub Datasheet SMSC USB2524 ...
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... BIT NUMBER BIT NAME 7:0 LANG_ID_L SMSC USB2524 DESCRIPTION Max Power Bus_Powered: Value in 2mA increments that the Hub consumes from an upstream port (VBUS) when operating as a bus-powered hub. This value includes the hub silicon along with the combined power consumption (from VBUS) of all associated circuitry on the board. This value also includes ...
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... LSB, MSB manner). Some EEPROM programmers may transpose the MSB and LSB, thus reversing the Byte order. Please pay careful attention to the Byte ordering or your selected programming tools. 28 DATASHEET TM USB MultiSwitch Hub Datasheet SMSC USB2524 ...
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... Register D1h: Port Assign Interface Configuration 0A (Reset = 0x00) BIT NUMBER BIT NAME 7:0 PORT_INT_0A SMSC USB2524 DESCRIPTION Serial String, UNICODE UTF-16LE per USB 2.0 Specification Maximum string length is 31 characters (62 Bytes) Note: The String consists of individual 16 Bit UNICODE UTF-16LE characters. The Characters will be stored starting with the LSB at the ...
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... Reserved, will default to ‘0001’ value to ‘1111’ Bit [3:0] = ‘0000’ Port 1 is unassigned ‘0001’ Port 1 owned by UP1 ‘0010’ Port 1 owned by UP2 ‘0011’ Reserved, will default to ‘0001’ value to ‘1111’ 30 DATASHEET TM USB MultiSwitch Hub Datasheet SMSC USB2524 ...
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... Register D9h: Port Assign Interface Configuration 2A (Reset = 0x00) BIT NUMBER BIT NAME 7:0 PORT_INT_2A SMSC USB2524 DESCRIPTION Port Assign Interface 1B: Determines the configuration of the hardware interface configuration for the assignment of ports 3 & upstream hosts. Bit [7:4] = ‘0000’ Port 4 is unassigned ‘0001’ Port 4 owned by UP1 ‘ ...
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... Reserved, will default to ‘0001’ value to ‘1111’ Bit [3:0] = ‘0000’ Port 1 is unassigned ‘0001’ Port 1 owned by UP1 ‘0010’ Port 1 owned by UP2 ‘0011’ Reserved, will default to ‘0001’ value to ‘1111’ 32 DATASHEET TM USB MultiSwitch Hub Datasheet SMSC USB2524 ...
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... Register E1h: Port Assign Interface Configuration 4A (Reset = 0x00) BIT NUMBER BIT NAME 7:0 PORT_INT_4A SMSC USB2524 DESCRIPTION Port Assign Interface 3B: Determines the configuration of the hardware interface configuration for the assignment of ports 3 & upstream hosts. Bit [7:4] = ‘0000’ Port 4 is unassigned ‘0001’ Port 4 owned by UP1 ‘ ...
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... Reserved, will default to ‘0001’ value to ‘1111’ Bit [3:0] = ‘0000’ Port 1 is unassigned ‘0001’ Port 1 owned by UP1 ‘0010’ Port 1 owned by UP2 ‘0011’ Reserved, will default to ‘0001’ value to ‘1111’ 34 DATASHEET TM USB MultiSwitch Hub Datasheet SMSC USB2524 ...
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... Register E9h: Port Assign Interface Configuration 6A (Reset = 0x00) BIT NUMBER BIT NAME 7:0 PORT_INT_6A SMSC USB2524 DESCRIPTION Port Assign Interface 5B: Determines the configuration of the hardware interface configuration for the assignment of ports 3 & upstream hosts. Bit [7:4] = ‘0000’ Port 4 is unassigned ‘0001’ Port 4 owned by UP1 ‘ ...
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... Reserved, will default to ‘0001’ value to ‘1111’ Bit [3:0] = ‘0000’ Port 1 is unassigned ‘0001’ Port 1 owned by UP1 ‘0010’ Port 1 owned by UP2 ‘0011’ Reserved, will default to ‘0001’ value to ‘1111’ 36 DATASHEET TM USB MultiSwitch Hub Datasheet SMSC USB2524 ...
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... NUMBER BIT NAME 7:0 PORT_ASSIGN_12 Port 1 & 2 Assignment to upstream host port. Determines which upstream port SMSC USB2524 DESCRIPTION Port Assign Interface 7B: Determines the configuration of the hardware interface configuration for the assignment of ports 3 & upstream hosts. Bit [7:4] = ‘0000’ Port 4 is unassigned ‘ ...
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... Bit 6= Reserved, always = ‘0’. Bit 5= Reserved, always = ‘0’. Bit 4= 1; Port 4 is locked. Bit 3= 1; Port 3 is locked. Bit 2= 1; Port 2 is locked. Bit 1= 1; Port 1 is locked. Bit 0 is Reserved, always = ‘0’ 38 DATASHEET TM USB MultiSwitch Hub Datasheet SMSC USB2524 ...
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... Reserved 2 INTF_PW_DN 1 RESET 0 USB_ATTACH SMSC USB2524 DESCRIPTION Reserved. {Note: Software must never write a ‘1’ to these bits} SMBus Interface Power Down 0 = Interface is active 1 = Interface power down after ACK has completed. {Note: This bit is write once and is only cleared by assertion of the external RESET_N pin ...
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... C) EEPROM (256x8). (please see for specific details on how to enable configuration via Master Specification (Please refer to the 2 C-Bus Specification for details Specification are not supported. 40 DATASHEET TM USB MultiSwitch Hub Datasheet Table 4.2, "SMBus bus protocols). The Hub’ EEPROM, and it conforms to the SMSC USB2524 ...
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... A Block Read or Write is allowed to transfer a maximum of 32 data bytes. For the following SMBus tables: Denotes Master-to-Slave Slave Address Data byte 1 Byte Count = N SMSC USB2524 Invalid Protocol Response Behavior on page Denotes Slave-to-Master Figure 7.1 SMBus Block Write Register Address Data byte 2 ...
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... The SMBus Slave Interface complies with the SMBus AC Timing Specification. See the SMBus timing in the “Timing Diagram” section. Revision 1.91 (08-22-07) Figure 7.2 SMBus Block Read Register Address Data byte 2 A Block Read ). TIMEOUT, MAX 42 DATASHEET TM USB MultiSwitch Datasheet Slave Address Data byte Devices that TIMEOUT, MIN SMSC USB2524 Hub 2 C ... ...
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... Default Strapping Option The USB2524 can be configured via a combination of internal default values and pin strap options. The strapping option pins only cover a limited sub-set of the configuration options. The internal default values will be used for the bits & registers that are not controlled by a strapping option pin. ...
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... Chapter 8 LED Interface Description The USB2524 supports 3 different (mutually exclusive) LED modes. USB Mode provides 8 LEDS, which conform to the USB 2.0 specification functional requirements for Green and Amber LED’s. Basic Host Owner LED Indication mode uses 8 Single color LED’s to provide user indication of upstream host ownership of the 4 downstream ports. Host Owner and Downstream Port Speed LED Indication mode uses 8 Dual Color LED’ ...
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... LED circuit will be implemented. The Circuit will need to be replicated for each of the 8 LED pins on the USB2524. In this circuit, when the LED pin is driven to a logic low state, the Green LED will Light up. When the LED pin is driven to a Logic High state the Red LED will Light up. When a 1KHz square wave is driven out on the LED pin, the Green and Red LED’ ...
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... HS, and FS/LS will remain FS/LS) What will change is the 3rd color which represents an assigned port with no connection, when in suspend the corresponding LED will be off (giving the same indication as unassigned, while the hub is suspended). This disables the 1khz toggle while the hub is suspended. Revision 1.91 (08-22-07) 46 DATASHEET TM USB MultiSwitch Hub Datasheet SMSC USB2524 ...
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... The PLL is halted. LED indicators are disabled. The Hub is “operational” 500μs after RESET_N is negated. Once operational, the Hub immediately reads OEM-specific data from the external EEPROM (if the SMBus option is not disabled) or the internal ROM. SMSC USB2524 47 DATASHEET Revision 1.91 (08-22-07) ...
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... Driven by Hub if strap is an output. Don’t Care MIN 1 16.7 16.7 100 undefined 48 DATASHEET TM USB MultiSwitch Hub Datasheet Start completion Idle request response t7 t8 TYP MAX UNITS μsec nsec 1400 nsec μsec 1.5 2.0 100 msec msec msec 5 msec SMSC USB2524 ...
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... Completion time for requests (with or without data stage). Note 9.2 When in Bus-Powered mode, the Hub and its associated circuitry must not consume more than 100mA from the upstream USB power source during t4+t5+t6+t7. SMSC USB2524 Attach USB Reset + USB recovery Set Options ...
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... SMBus Code Hub PHY USB Reset USB Load Stabilization recovery Upstream MIN 1 Note 9.3) 100 50 DATASHEET TM USB MultiSwitch Datasheet Start completion Idle request response TYP MAX UNITS μsec μsec 500 250 300 msec 100 msec msec Undefined msec 5 msec SMSC USB2524 Hub ...
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... Hub Datasheet Complies with Section 11.10 of the USB 2.0 Specification for behavior after completion of the reset sequence. The Host then configures the Hub and the Hub’s downstream port devices in accordance with the USB Specification. SMSC USB2524 51 DATASHEET Revision 1.91 (08-22-07) ...
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... Chapter 10 XNOR Test Please contact your SMSC representative for a detailed description of how this test mode is enabled and utilized. Revision 1.91 (08-22-07) 52 DATASHEET TM USB MultiSwitch Hub Datasheet SMSC USB2524 ...
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... Hysteresis (‘IS’ Only) V HYSI Input Buffer with Pull-Up (IPU) Low Input Level V High Input Level V Low Input Leakage I ILL High Input Leakage I IHL SMSC USB2524 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +4. +3.3 V tolerance -5% to ±10 DDA33 Table 11.1 DC Electrical Characteristics MIN TYP MAX UNITS 0.8 ILI 2.0 IHI -10 ...
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... Upstream Port the process of being mA enumerated by an external Host controller (all downstream ports assigned to the Upstream port under enumeration). Note: Both Upstream Ports are in the process of being enumerated by mA external Host mA controllers. Total from all supplies SMSC USB2524 Hub ...
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... Clock Input C IN Capacitance Input Capacitance C IN Output Capacitance C OUT Power Sequencing There are no power supply sequence restrictions for the Hub. The order in which power supplies power-up and power-down is implementation dependent. SMSC USB2524 MIN TYP MAX UNITS 182 mA 182 mA 182 mA 182 mA μ ...
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... The Hub conforms to all voltage, power, and timing characteristics and specifications as set forth in the USB 2.0 Specification which is available at the Specification for more information. Revision 1.91 (08-22-07) www.usb.org web site. Please refer to the USB 56 DATASHEET TM USB MultiSwitch Hub Datasheet Section 7.3, SMSC USB2524 ...
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... TM USB MultiSwitch Hub Datasheet Chapter 13 Package Outline Figure 13.1 USB2524 56-Pin QFN Package Outline and Parameters SMSC USB2524 57 DATASHEET Revision 1.91 (08-22-07) ...